Dental plate



(No Model.) I

- A. H. PARKER.

- DENT-AL PLATE. "No. 317,66'7 a Patented May '12, 1885.

'IIIIII WITNEEEIEEL INVENTUR.

N, PETERS. Plwto-Lilhognplur, Wuhingwn, EC.

UNITED STATES PATENT OFFICE.

AARON H. PARKER, OF BOSTON, MASSACHUSETTS.

DENTAL PLATE.

SPECIFICATION fcrming part of LettersPatent No. 317,667, dated May 12,1885.

Application filed April 9, 188 1. (No model.)

To all whom it may concern.-

Be it known that I, AARON H. PARKER, of Boston, Massachusetts, a citizenof the United States, have invented certain new and useful Improvementsin Dental Plates, of which the following is a specification.

My invention relates to improvements in the construction of dentalplates adapted to be secured in place within the mouth of the wearer byatmospheric pressure; and it has for its object to obtain a more firmand rigid fitting and holding of such plates than have heretofore beenaccomplished.

In the accompanying drawings is represented a dental plate in which mypresent improvement is embodied in the form now best known to me.

Figures 1 and 2 are views in plan of the upper and lower sides of saidplate, respectively. Fig. 3 is a vertical section through said plate onthe line :0 x of Fig. 1, and Fig. t a section of apart of Fig. 3,illustrative of its construction and operation, both these figures beingupon an enlarged scale as compared with Figs. 1 and 2.

My present improvement consists, in part, in forming a passage throughthe plate, whereby the air between it and the mouth may be exhaustedmore readily and completely, and the plate thereby fitted more firmlyand se curely than could heretofore be done. In connection with thispassage I provide a valve to prevent the re-entrance of air from outsideunder atmospheric pressure.

In addition to the vacuum chamber or depression A, I may also add to itauxiliary chambers or depressions B B, preferably located upon the rearlateral parts of the plate under the extremities of the alveolarprocesses, as shown. These auxiliary chambers, which I believe to be newwith myself, are preferably made to connect or communicate with the mainchamber A, so that the exhausting, sucking, or drawing out of the airthrough the one valved passage will exhaust the air from all thechambers A B B. It is obvious that a valved air-exhaust may be applieddirectly to each supplementary chamber,

although the construction shown in Fig. l is preferred by me.

The relative location of the vacuum-chambers A B B, which form thepoints of strongest adhesion of the plate, should be substantiall y asshown, the main or central chamber,

A, covering the central palatal surface of the plate, and the subsidiarychambers,B B,being located in the base or rearward lateral eXtremitiesor heel-pieces, as shown. The collective area of these three chambersmay be as large as their location upon the plate will permit, so long asenough of the true surface or base of the plate is left to give a goodbearing against the mouth and prevent pain and dis comfort to thewearer.

\Vhen the air-passage a is formed in a plate provided with a singlevacuum-chamber, it should connect with said chamber; when a series ofvaeuunrchambers is used, Iprefer to carry theair-passage from the mainor central chamber of the series.

The valving of the airexhaust passage (0 may be done in any desiredmanner which will permit the air to be drawn out and prevent its return.

I have shown in Figs. 2, 3, and 4 a convenient method of forming thevalve and attaching it in its place. The valve represented in thesefigures I make of a disk of kid or similar suitable packing material,(shown at b,) over which is placed a retaining-plate, 0, formed of thesame material as the dental plate itself, commonly hard rubber, and thisis kept in place by the button (I, Fig. 2. The seating for the plates band c, I ordinarily form in the plate itself, as shown in the drawings.

air-passage a, and the valve that normally closes the air-passage andthat is sunk into the plate so as to present a plane surface to theinterior of the mouth.

bination of the main vacuum-chamber A, the In testimony whereof I havehereunto subsupplemental chambers 13 B, passages for scribed my namethis 7th day of April, A. D. connecting the chambers, the air-exhaust a,1884.

valve 1), plate 0, and retaining device d, said AARON H. PARKER. 5valve, plate, and. retaining device being sunk Witnesses:

below the surface of the plate, substantially J. HENRY TAYLOR,

as set forth. JAMES F. BLIGH.

